US3273151A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antenna system
Assignee: AT&T Inc
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Filing: 1961-12-26
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Granted: 1966-09-13
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Expires: 1981-12-26
Abstract
No abstract record available.
Inventors
- 👤 Cassius C Cutler
- 👤 Kompfner Rudolf
- 👤 Le Roy C Tillotson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:55
CPC Classifications
H; H01; H01Q; H01Q3/00; H01Q3/26; H01Q3/30; H01Q3/34; H01Q3/42
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
114 words
IN A COMMUNICATION SYSTEM, AN ARRAY OF ANTENNA ELEMENTS, A SOURCE OF INFORMATION-BEARING ELECTROMAGENTIC WAVES FOR IRRADIATING SAID ARRAY, COMBINING MEANS, A LOCAL OSCILLATOR, AND APPARATUS INDIVIDUAL TO EACH OF SAID ANTENNA ELEMENTS COMPRISING MEANS FOR RECOVERING AN INFORMATION COMPONENT AND AN UNMODULATED SINE WAVE SIGNAL TO SERVE AS A PILOT COMPONENT FROM THE PORTION OF SAID WAVE IMPINING UPON SAID ANTENNA ELEMENT, FIRST MEANS FOR MIXING SAID PILOT COMPONENT WITH THE OUTPUT OF SAID OSCILLATOR, SECOND MEANS FOR MIXING SAID INFORMATION COMPONENT WITH THE DIFFERENCE FREQUENCY MODULATION SIDEBAND PRODUCED BY SAID FIRST MIXING MEANS, AND MEANS FOR APPLYING THE SUM FREQUENCY MODULATION SIDEBAND PRODUCED BY SAID SECOND MIXING MEANS TO SAID COMBINING MEANS.
References Cited (Backward Citations)
US3036210A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-09-12 | 1970-03-14 | 1970-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-12 | 1974-03-14 | 1974-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-12 | 1978-03-14 | 1978-09-13 | $7700.00 | Window Closed / Lapsed |